Dipper front



Aug. 1, 1933. s. G. LLEWELLYN DIPPER FRONT Filed Aug. 28, 1951 zzae va zen/027 62 0 fi Patented Aug. 1, 1933 UNITED STATES 1,920,703 DIPPER FRONT Samuel G. Llewellyn, Evanston, 111., assignor to Pettibone Mulliken Company, a Corporation of Delaware Application August 28, 1931. Serial No. 559,969

Claims.

My invention relates to the fronts of dippers such as are used for excavating work and are commonly provided with teeth to enhance the digging action; and more particularly to dipper 5 fronts formed along their upper edges of separated front and rear wall portions united integrally by cross-webs or partitions causing the fronts to present sockets or cells opening through the upper edges of the dipper fronts.

vide in a dipperfront of the constructionabove referred to for the presentation by the dipper front, between the teeth secured thereto, of a front cutting edge and the provision of the teeth supports of such construction and disposition that the minimum waste of metal will result in the wearing away of the teeth and without danger of impairing the dipper front proper. Referring to the accompanying drawing: Figure 1 is a plan view of a dipper front embodying my invention, a portion of the front being shown in plan section.

Figure 2 is a section taken at the line 2-2 on Fig. 1 and viewed in the direction of the arrows.

Figure 3 is a section taken at the line 3-3 on Fig. 1 and viewed in the direction of the arrows; and

Figure 4, a sectional view showing the manner of securing the tooth to the tooth-base.

Referring to the particular illustrated embodiment of my invention, the single wall body portion thereof common to dipper fronts is represented at 5 and the upper portion thereof at 6.

This upper portion 6 is of cellular form being 35 formed of the upper portion '7 of the wall 5, a

second wall portion 8 in front of the wall portion '7 and extending above the latter, spaced apart ribs, or partitions, 9 connecting the wall portions 5 and 8, and a rearwardly downwardly sloping 4O platelike portion 10 spanning the space between the wall port-ions '7 and 8 at their upper edges,

the whole being integrally formed, as for example by casting the structure in one piece from any suitable metal.

The ribs, or partitions, v9 are preferably so spaced, as shown, that alternate ones of the cells, or sockets, thereby provided are much narrower than the others thereof, these cells, or sockets, being represented at 11 and 12, respectively, the 50 cells, or sockets, 12, opening at their upper ends through the platelike portion 10 to permit of the insertion, into the sockets 12, of tooth-equipped tooth-bases 13. N The tooth-bases 13 are provided at their lower ends with shanks 14 fitting the sockets 12, and

One of the objects of my invention is to pro present above the shanks, shoulders 15 and 16, the shoulders 15 bearing against the upper edge of the wall portion '7 and the shoulders 16. against the upper edge of the wall portion- 8, the bases 13 being provided in front of the shoulders 16 with depending lips 1'7 opposing the front face of the wallportion 8; a

The tooth-bases are shown as firmlyheld in place in the sockets by tapered pins 18 driven through openings 19 and 20 in the wallportions 7 and 8 and openings 21 in the shanks 14.

The formation of the upper edge portion of the dipper front as shown and described presents a cutting edge portion 22 on the front proper which is exposed between the teeth bases 13 for cutting into the material to be charged into the bucket of which the dipper front is a part, the bases 13 7 being of such form as shown, as to extend up wardly beyond the cuttingedge'22 a substantial distance. l

The tooth bases 13 are represented as provided at their upper extremities with teeth 23 secured thereto in any desirable way as for example by providing downwardly extending tongues 24 on the teeth which extend into upwardly-opening recesses 25 in the bases 13, the bases at opposite sides of the recesses 25 having upwardly extending tongues 26 which extend into recesses 27 in the teeth 23, the teeth being secured to the bosses by pins 28 driven into registering grooves 29 and 30 in walls of the recesses 25 and faces of the tongues 24, respectively.

By the arrangement shown and described a strong and durable construction of tooth-equipped front is provided and danger of undue wear of the upper edge of the dipper-front proper is avoided, the teeth, upon becoming worn to an extent rendering substitution necessary or desirable being readily removable and replaceable-by other similar teeth. Thus those parts of the structure which are subjected to the greatest wear may be renewed at comparatively small expense compared with the expense which would be involved in case the body portion of the front was subjected to wear requiring its replacement.

While I have illustrated and described a particular construction embodying my invention, I do not wish to be understood as intending to limit it thereto as the same may be variously modified and altered without departing from the spirit of my invention.

What I claim as new, and desire to secure by Letters Patent, is:

1. An excavating dipper comprising, in combi- 110 nation, a dipper-front wall; a second wall spaced in front of said dipper-front wallout of parallel therewith longitudinally of the dipper, extending continuously across the dipper-front wall; said second wall thickened at its forward portion and projecting above the dipper-front wall to provide a cutting edge; spaced ribs extending between said walls perpendicular to the cutting edge providing upwardly open sockets therebetween of increasing depth toward the cutting edge; a cutting edge wall connecting the upper edges of said spaced walls, sloping from the dipper-front wall to the cutting edge, closing certain of said sockets and having openings therein into the re- 7 maining sockets; andteeth formed with rearwardly sloping shoulders abutting said cutting edge wall, the bases thereof entering the upwardly open sockets. g

2. A dipper front comprising a front proper the upper edge of which is formed of spaced apart wall-portions connected by spaced-apart ribs substantially perpendicular to said upper edge, the upper edge of the wall portion at the rear side of said front. terminating below the upper edge of the other of said wall portions and a portion spanning the space between said wall portions at the top thereof and inclining downwardly and rearwardly whereby the upper edge of. said front presents a cutting edge portion,

' the spaces between certain'of said ribs opening through said last-named portion, and teeth formed with rearwardly sloping shoulders abutting the cutting edge wall and with lips overlapping the upperedges of said wall portions, the bases of said teeth enteringthe upwardly open sockets.

3. An excavating dipper comprising, in combination: a dipper-front wall; a second wall spaced in front of said dipper-front wall out of parallel therewith longitudinally of the dipper, extending continuously across the dipper-front wall and projecting above the dipper-front wall to provide a cutting edge; spaced ribs extending between said walls perpendicular to the cutting edge providing soc zets therebetween of increasing depth toward the cutting edge; a cutting edge wall connecting the upper edges of said spaced walls, sloping from the dipper-front wall to thecutting edge, closing certain of said sockets and having openings therein into the remaining sockets; and teeth formed with rearwardly sloping shoulders abutting said cutting edge wall, the bases thereof entering the upwardly open sockets.

4. An excavating dipper comprising, in combination: a dipper-front wall; a second wall spaced in front of said dipper-front wall and extending continuously across the dipper-front wall and projecting above said dipper-front wall to provide a cutting edge; pairs of spaced ribs extending between said walls perpendicular to .the cutting edge; the ribs of each pair spaced apart a less distance than the spacing between adjacent ribs of adjacent pairs to provide relatively narrow cells and relatively wider sockets; a cutting edge wall connecting the upper edges of said spaced walls, closing the upper ends of said narrow cells and having openings therethrough into said sockets; and teeth, the bases thereof secured in said sockets.

5. A dipper front comprising a front proper the upper edge of which is formed of spaced apart wall portions, ribs connecting said wall portions, the upper edge of the wall portion at the rear side of said front terminating below the upper edge of the other wall portion, a wal1lportion spanning the space between said first named wall portions at the-top thereof and inclining downwardly and rearwardly whereby the upper edge of said front presents a cutting edge, said inclined wall portion formed with openings to receive teeth, and teeth formed with rearwardly sloping shoulders abutting the cutting edge wall and with lips overlapping the upper edges of the first named wall portions, the bases of said teeth extending downwardly into said openings and between said spaced apart wall portions.

SAMUEL G. LLEWELLYN. 

